Brass quadrant of 18-inch radius with optical sights on a tripod stand. Made by Peter and John Dollond, St Paul’s churchyard, London, and issued by the British Admiralty for surveying work in Lower Canada.
This London-made quadrant was supplied by the British Admiralty around 1800 for surveys in Lower Canada, present-day Quebec. It is associated with Lt.-Colonel Joseph Bouchette (1774-1841), the Surveyor-General of Lower Canada.
Quadrants are used to measure the altitude of celestial objects and the angular distance between them. They were used by surveyors to determine precisely their longitude and latitude.
Much of the territory in Lower Canada was relatively unknown to the British. They produced maps, charts and topographical sketches of the region as they sought to defend their interests against indigenous peoples, and against the French and Americans.
- Object Number:
- furnishing and equipment
- measuring device - instrument
- British Admiralty (Hydrographic Department)
Cite this page
We encourage the use and reuse of our collection data.
Data in the title, made, maker and details fields are released under Creative Commons Zero
Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence
Download catalogue entry as json
Download manifest IIIF
Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.